Solid line = floor (spellings that unambiguously belong to the group). Shaded band up to the dashed edge = ceiling (the most it could reach if every ambiguous spelling counted here).
Tenley has been slowly declining from its former popularity. All-time it's been given to 10,522 U.S. babies, the 1,729th most common name by sound today, peaking at 1,009 in 2011, with 135 in 2025.
By sound, Tenley also includes the spellings Tinley.